Updates vapigen-generated vapi files to vala-0.34.
Files are now copied to $(STAGING_DIR_HOSTPKG)/share/vala/vapi, without
the vala version being hardcoded.
Removed copyright line, and redundant PKG_BUILD_DEPENDS and
TARGET_LDFLAGS.
Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>